Quote:
Originally Posted by johnblagg
copper sulphate is a fungicide but Im not sure how safe for orchids because of the copper portion .....they used to call it Bordeux mixture and it is used on grapes and many other things...it also is used to kill algae in ponds
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FWIW, Copper Sulfate Pentahydrate is the active ingredient in Phyton 27. If using Phyton 27, be sure to read the handling precautions and wear rubber gloves while adding it to water to dilute. You don't want to get the undiluted stuff on your skin.
Copper(II) sulfate - Wikipedia, the free encyclopedia